He plays hurling with his local club Croom and with the Limerick senior inter-county team.
The following year O'Riordan won a second set of Munster and All-Ireland under-21 honours, as Limerick completed the second leg of a three-in-a-row.
By this stage he had already joined the county senior team, however, Limerick's hurling fortunes were about to take a dramatic downturn.
O'Riordan was part of the Limerick team that won the Munster U21 Championship in 2000 he also played in the All Ireland Final but lost out to Tyrone.
In 2010 he helped Limerick win the National Football League Div 4 title beating Waterford in the final in Croke Park.